An anesthesiologist accused of trying to kill his wife during a cliffside hike in Hawaii went before jurors Tuesday as prosecutors laid out a timeline of what they said happened near a popular scenic lookout on Oahu in March 2025. The case centers on competing accounts of the attack and whether Gerhardt Konig, 47, intended to kill his wife, Arielle Konig, or whether he acted in self-defense as he and his wife struggled near the edge of a cliff.
Before jurors began deliberating Tuesday, deputy prosecutor Joel Garner told jurors that Konig had a plan and backup plans for murdering his wife during a weekend trip to Honolulu for her birthday. Garner said Konig tried to push her off the cliff, and when that attempt did not work, he tried to stab her with a syringe filled with an unknown substance. Garner then told the jury that when those efforts failed, Konig grabbed a rock, struck her with it, and pieces of the rock broke off in her scalp.
“Every backup plan ends in Arielle’s death,” Garner said, as he displayed the rock and photographs showing her injuries, according to the courtroom presentation described in the trial coverage. Garner also told jurors that, near a lookout offering sweeping views, Konig attacked his wife after she became involved in a scuffle, and that he stopped only when two other hikers interrupted the assault. The jury heard testimony about the couple’s relationship before the hike, including details of their marital conflict.
Konig’s lawyer, Thomas Otake, told jurors Tuesday that there were no murder plans. Otake also challenged the prosecution’s version of events by disputing Arielle Konig’s account of what happened during the hike. Konig has pleaded not guilty to attempted murder, and he has maintained that he was defending himself from Arielle Konig, who he said attacked him with the rock first.
Otake argued that the prosecution’s story did not fit with what a person trying to kill would do if he had a syringe in a remote area. He suggested that if Konig had intended to kill his wife and had access to a syringe, it would have made more sense for him to use it before the physical struggle rather than attempting to fill it after wrestling with her. Otake told the jury, “You would use the syringe first,” and said, “It makes no sense.”
The trial described how the couple’s relationship issues came up during the hike itself. Prosecutors said Konig was upset about his wife’s relationship with a coworker. Testimony also described the couple’s two young sons, who stayed home on Maui while the trip unfolded, and how the hike ended with Arielle Konig bloodied and screaming that her husband tried to kill her near the lookout.
Konig testified that his wife was having an affair and said he confirmed it by unlocking her phone while she slept. Arielle Konig testified that she and her husband discussed the relationship while they were hiking and said it involved flirty messages with a coworker and described it as an “emotional affair.” She testified that her husband grabbed her, moved her toward the cliff’s edge, and that she threw herself on the ground to try to hold on. She also testified that he had a syringe in his hand, that she batted it away, and that she bit his forearm and squeezed his testicles during the struggle to get him off her.
Konig, however, testified that he did not push his wife toward the edge. He said she hit him with a rock on the side of his face and that he wrestled the rock away before hitting her with it twice in self-defense. He also denied having any syringes on the mountain or trying to stab her. His defense attorney told the jury there was no syringe found at the scene because Konig never had one, and the prosecution countered that all of the blood found on the rock and on clothing belonged to Arielle Konig rather than her husband.
The trial testimony also included what happened after the alleged attack. Prosecutors said Konig spent about eight hours hiding on the mountain before deciding to come down, and even then tried to flee when confronted by police. Konig testified that as he watched his wife crawl away, he believed his marriage and career were over and that he decided to jump to his death, but that he first called his adult son from a previous marriage. Garner told jurors that the son reported Konig said he “tried to kill your stepmom,” which Konig denied having said.
Otake told jurors that Konig was not someone who would try to commit murder, describing him instead as a man struggling with infidelity who was trying to do his best. Otake also quoted from a heart-shaped birthday card Konig had written to his wife, calling her “the heart of our family” and saying, “The kids and I hit the jackpot with you.” Arielle Konig has since filed for divorce.
As covered by MSI after the verdict, the case ultimately played out in the jury system and led to a conviction on a lesser charge after attempted murder was heard in the same matter.